Albert Barnes Commentary Psalms 105:18

"His feet they hurt with fetters: He was laid in [chains of] iron," — Psalms 105:18 (ASV)

Whose feet they hurt with fetters - In Genesis 40:3, it is said of Joseph that he was “bound” in prison. It is not improbable that his “feet” were bound, as this is the usual way of confining prisoners.

He was laid in iron - In the prison. The margin is, “his soul came into iron.” The version in the Prayer-Book of the Episcopal Church is, “the iron entered into his soul.” This is a more striking and beautiful rendering, though it may be doubted whether the Hebrew will permit it. DeWette renders it, “In iron lay his body.”